- wrenghi



C. H. LEONARD Nov. 23, i1937.

WRENCH Filed Feb. ll, 1957 Patented Nov. 23, i937 ammi Wannen?.

apniicetiomnebmaryiu, 19377, `seria-1fno.,r1z5gs,sie: gomma.; (on :iL-,163).

This invention relates to wrenchessandhasiifor;

aniimportant object' thereof the provision. of a wrench provided with a looped movable jaw which is actuated under the action of diierential threads engaged by a jaw operating member.

Another object of this invention is to provide in a wrench a handle carrying nut member at l each end provided with interior threads which are of right and left hand pitch so as to eifect a speeding up o-f the movement of the movable jaw upon rotation of the handle or nut member.

A further object of this invention is to provide a wrench of this character which is exceedingly simple in construction and which can be readily manufactured and which is so constructed that after the initial assembly of the device, the nut member cannot be unthreaded entirely from the tubular handle or'rod, thus preventing loss of any of the parts of the wrench. j

With the foregoing and other objects in view, the invention will be more fully described here-r inafter, and will be more particularly pointed out in the claims appended hereto.

In the drawing. wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is a detail side elevation of a wrench constructed according to an embodiment of this invention.4

Figure 2 is a longitudinal section tail of the wrench,

Figure 3 is a fragmentary sectional view taken on the line 3 3 of Figure 1.

Referring to the drawing, the numeral Ill designates generally an elongated, tubular member provided atits rear end with exterior threads I3 which are of a right hand pitch and which extend inwardly from the rear end to a suitable point partly in dealong the length of the tubular member I0. Thev forward end of the tubular member I IIis provided with a pair of spaced apart at arms II between which a stationary jaw member I2 engages. The jaw I2 is secured between the spaced arms II by means of a headed pin I4 or the like.

The work engaging face of the stationary jaw member I2 is provided with an angular face portion I5 within which a pair of the nut faces are adapted to engage. A movable jaw member, generally designated as I6, is constructed in substantially looped form and is provided with parallel side portions I'I connected together at the outer ends thereof with a curved jaw member I8 provided with a serrated inner face portion I9, confronting the Work engaging face portions I5 of the stationary jaw member l2.

fmjawfoperatingl rod20is-.slidably maurited-:with-V inrf.theatubnlar'memberE Irniland .its -l forward-ende is connected to the movable jaw member I6, as at 2|, the forward end of the operating rod 20 being secured as by Welding or the like to a connecting 5 member 20 which connects the parallel arms I1 of the movable jaw member I6 together at their inner or rear ends. 'I'his connecting member 2| engages between the parallel arms II and is movable for a distance substantially equal to the 10 space between theI inner end of the stationary jaw member I5 and the rear ends of the parallel arms II.

The rear end of the operating member 20 is provided with threads 22 which, in the present 15 instance, are left hand threads and may be of a different pitch than the right hand threads I3 on the tubular member I0 so that when the handle 23, having a nut 24 at its forward end, is threaded up'onto the right hand threads I3, the nut 25 '20 carried by the rear end of the handle 23 will unthread from the left hand threads 22 at a rate different from the travel of the nut 24 on the threads I3. In this manner, the movable jaw I6 will have a relatively fast movement toward or 25 away from the stationary jaw I5. e

In the use and operation of this wrench, the nut o-r other article to be threaded or unthreaded is engaged within the movable ljaw member I 6 whereupon the handle 23 may be turned to the 3() left so as to unthread the nut portion 24 from the right hand threads I3. This rearward movement of the nut member 24 will effect rearward movement of the operating rod 20. Due to the differential and left hand threads 22 on the rod 35 20, when the handle 23 is turned to the left so as to unthread the nut 24 from the threads I3, the nut member 25 at the rear end of the handle 23 will thread forward on the rod 20. Due to the rearward movement of the handle 23 as the nut 40 25 moves forwardly on the threads 22, the rod 20 will be moved rearwardly at a more rapid rate than is eifected by the pitch of the threads I3 so that the movable jaw I6 will move at a relatively rapid rate and thus engage the work be- 45 tween the stationary jaw I5 and the jaw portion I3 of the movable jaw I6. The work may be released from between thetwo jaw members I5 and I8 by turning the handle 23. forwardly so as Y to move the nut member 24 forwardly on the 50 right hand threads I3 and simultaneously unthread the nut member 25 from the left hand threads 22.

It is, of course, understood that various changes and modifications may be made in the 55 jaw member disposed forwardly of said station.

ary jaw member, a pair of parallel arms secured to said movable jaw member and engaging on opposite sides of said stationary jaw member, an operating rod disposed Within said tubular member and secured at its forward end to said latter parallel arms, threads carried by the rear end of said operating rod, said latter threads being reversely pitched from said first threads, a hollow handle, a nut member carried by thefor- Ward end of said handle threadably engaging said first named threads, and a nut member carried by the rear end of said handle and threadably engaging said second named threads.

2. A Wrench comprising a tubular member provided with threads at one end thereof, spaced apart parallel arms carried by the other end of the member, a stationary jaw member carried by said arms and disposed therebetween, a movable jawmember disposed forwardly of said stationary. jaw. member, a pair of parallel arms-secured to said movable jaw member and engaging on o-p- Yposite sides of said stationary jaw member, an

operating rod disposed within said tubular member and secured at its forward end to said latter parallel arms, threads carried by the rear end of said operating rod, Said latter threads being reversely pitched from said first threads, and a hollow handle provided with interior threads engaging said rst named threads and a second series of interior threads engaging said second named threads.

y CARL I-I. LEONARD. 

